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Message-ID: <20251007161948.12442-1-rakuram.e96@gmail.com>
Date: Tue, 7 Oct 2025 21:47:44 +0530
From: Rakuram Eswaran <rakuram.e96@...il.com>
To: ulf.hansson@...aro.org
Cc: zhoubinbin@...ngson.cn,
u.kleine-koenig@...libre.com,
chenhuacai@...nel.org,
david.hunter.linux@...il.com,
skhan@...uxfoundation.org,
khalid@...nel.org,
linux-mmc@...r.kernel.org,
linux-kernel@...r.kernel.org,
rakuram.e96@...il.com,
linux-kernel-mentees@...ts.linux.dev,
kernel test robot <lkp@...el.com>,
Dan Carpenter <dan.carpenter@...aro.org>
Subject: [PATCH] mmc: pxamci: Fix passing NULL to PTR_ERR() in pxamci_probe()
Smatch reported:
drivers/mmc/host/pxamci.c:709 pxamci_probe() warn: passing zero to 'PTR_ERR'
Case 1:
When dma_request_chan() fails, host->dma_chan_rx is an ERR_PTR(),
but it is reset to NULL before using PTR_ERR(), resulting in PTR_ERR(0).
This mistakenly returns 0 instead of the real error code.
Case 2:
When devm_clk_get() fails, host->clk is an ERR_PTR() resulting in the similar
issue like case 1.
Store the error code before nullifying the pointers in both the cases.
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/r/202510041841.pRlunIfl-lkp@intel.com/
Fixes: 58c40f3faf742c ("mmc: pxamci: Use devm_mmc_alloc_host() helper")
Signed-off-by: Rakuram Eswaran <rakuram.e96@...il.com>
---
Build and Analysis:
This patch was compiled against the configuration file reported by
0day CI in the above link (config: s390-randconfig-r071-20251004) using
`s390x-linux-gnu-gcc (Ubuntu 14.2.0-19ubuntu2) 14.2.0`.
Static analysis was performed with Smatch to ensure the reported warning
no longer reproduces after applying this fix.
Command used for verification:
ARCH=s390 CROSS_COMPILE=s390x-linux-gnu- \
~/project/smatch/smatch_scripts/kchecker ./drivers/mmc/host/pxamci.c
drivers/mmc/host/pxamci.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 26d03352af63..4fab693d3b32 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -653,8 +653,9 @@ static int pxamci_probe(struct platform_device *pdev)
host->clk = devm_clk_get(dev, NULL);
if (IS_ERR(host->clk)) {
+ ret = PTR_ERR(host->clk);
host->clk = NULL;
- return PTR_ERR(host->clk);
+ return ret;
}
host->clkrate = clk_get_rate(host->clk);
@@ -705,8 +706,9 @@ static int pxamci_probe(struct platform_device *pdev)
host->dma_chan_rx = dma_request_chan(dev, "rx");
if (IS_ERR(host->dma_chan_rx)) {
+ ret = PTR_ERR(host->dma_chan_rx);
host->dma_chan_rx = NULL;
- return dev_err_probe(dev, PTR_ERR(host->dma_chan_rx),
+ return dev_err_probe(dev, ret,
"unable to request rx dma channel\n");
}
--
2.48.1
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